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Nano-structured catalyst capable of activating multiple catalytic effects, and application thereof

A nanostructure and catalyst technology, which is used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst activation/preparation, etc., to achieve the effects of easy operation, improved catalytic degradation ability, and reduced size

Pending Publication Date: 2020-08-25
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that bismuth ferrite has strong self-assembly ability and rapid crystal growth. In addition, it is sensitive to conditions such as temperature and oxygen pressure during the synthesis process. Therefore, a major challenge in the preparation of bismuth ferrite is how to synthesize it. The fine control of the process avoids the formation of impurity phases and realizes the regulation of morphology and structure

Method used

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  • Nano-structured catalyst capable of activating multiple catalytic effects, and application thereof
  • Nano-structured catalyst capable of activating multiple catalytic effects, and application thereof
  • Nano-structured catalyst capable of activating multiple catalytic effects, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of cubic bismuth ferrite nanostructured cluster catalysts for activating various catalytic effects (S1 sulfate radical activation catalysis, S2 visible light-Fenton catalysis, S3 visible light photocatalysis), and applied to water form Degradation of base orange pollutants.

[0035] Prepare cubic bismuth ferrite nanostructured cluster body catalyst, the steps are as follows:

[0036] 1) Dissolve 16g of citric acid in 30mL of deionized water to prepare citric acid solution A. 6.05g Bi(NO 3 ) 3 ·5H 2 O, 10.61g Fe(NO 3 ) 3 9H 2 O dissolved in 5 mL of 2M HNO 3 In the aqueous solution, mix with the citric acid solution A prepared above, and stir for 15 minutes so that the citric acid in the mixed solution interacts with the Bi / Fe ions to form a trinuclear Bi / Fe-citrate complex;

[0037] 2) Add 180mL of 12M NaOH aqueous solution to the mixed solution obtained in step 1) under vigorous stirring, and stir for 30 minutes to convert the trinuclear Bi...

Embodiment 2

[0055] To prepare a cuboid-shaped bismuth ferrite nanostructured cluster catalyst, the preparation steps were repeated in Example 1, except that "the hydrothermal reaction time in step 4) was adjusted to 20 minutes", and the remaining conditions were the same as in Example 1. Finally, a bismuth ferrite nanostructured cluster catalyst is prepared.

[0056] The SEM figure of the bismuth ferrite nanostructured cluster body catalyst prepared in embodiment 2 is as follows Figure 4 shown. From Figure 4 It can be seen that the bismuth ferrite nanostructured catalyst presents a uniform nanocuboid structure with a side length of ~230 nm and a height of ~600 nm, with high uniformity and narrow size distribution. The nanostructured cluster body has a relatively high specific surface area, which is beneficial to improving its catalytic activity.

[0057] S1 Sulfate Activation Catalysis: The bismuth ferrite nanostructured cluster catalyst prepared in Example 2 cooperates with PMS to f...

Embodiment 3

[0061]To prepare a square plate-shaped bismuth ferrite nanostructured cluster catalyst, the preparation steps were repeated in Example 1, except that "the hydrothermal reaction time in step 4) was adjusted to 60 minutes", and the rest of the conditions were the same as in Example 1 , and finally a bismuth ferrite nanostructured cluster catalyst was prepared.

[0062] The SEM image of the bismuth ferrite nanostructured catalyst prepared in embodiment 3 is as follows Figure 5 shown. From Figure 5 It can be seen that the bismuth ferrite nanostructured cluster catalyst presents a uniform nanosquare plate-like structure with a side length of ~380 nm and a thickness of ~80 nm. The cluster body of the nano-plate structure has a relatively high specific surface area, which is beneficial to improving its catalytic activity.

[0063] S1 Sulfate Activation Catalysis: The square plate-shaped bismuth ferrite nanostructured cluster catalyst prepared in Example 3 cooperates with PMS to ...

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Abstract

The invention discloses a nano-structured catalyst capable of activating multiple catalytic effects, and application thereof. A preparation method of the catalyst comprises the following steps: fullyreacting bismuth salt, ferric salt and citric acid to form a trinuclear Bi / Fe-citrate complex; then, under the adding effect of a NaOH solution, forming a Bi / Fe composite hydroxide with rich citrate surface activity, carrying out a low-temperature oil-bath dehydration coprecipitation reaction, and carrying out a hydrothermal reaction in the presence of citric acid, urea and other conventional additives to successfully prevent the rapid growth nature of bismuth ferrite, thereby finally preparing the morphology-controllable nano-structured bismuth ferrite regular cluster composed of nano-scale bismuth ferrite crystals, wherein the regular cluster is the catalyst. The catalyst provided by the invention has multiple functions, shows high catalytic degradation activity on organic matters, and can effectively degrade the organic matters in a water body through modes such as sulfate radical activation catalysis, a visible light-Fenton catalytic system and visible light photocatalysis, and a proper catalytic degradation mode can be correspondingly selected according to different types of the organic matters.

Description

technical field [0001] The invention relates to the technical field of water body pollutant treatment, in particular to a nanostructured catalyst capable of activating various catalytic functions and its application. Background technique [0002] Ternary metal oxides whose structure can be defined as A x B y o z (such as Bi 2 Fe 4 o 9 , NiFe 2 o 4 , ZnMn 2 o 4 , CaTiO 3 , LaCrO 3 , BiMnO 3 , Bi 2 WO 6 ,CoMoO 4 etc.), generally contain one or more transition metal elements, so they usually have a variety of functionalities and can be applied in different aspects. Among them, bismuth ferrite has weak ferromagnetism and ferroelectricity at room temperature, and is a composite iron-based catalytic material with good prospects. It is generally believed that it has three spontaneously polarized structures, namely perovskite BiFeO 3 , Mullite Bi 2 Fe 4 o 9 and silicate Bi 25 FeO 40 . Many studies have shown that they have unique physical and structural propert...

Claims

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Application Information

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IPC IPC(8): B01J23/843B01J37/08B01J37/10C01G49/00B82Y40/00C02F1/30C02F1/72C02F101/30
CPCB01J23/8437B01J37/082B01J37/10C01G49/0018B82Y40/00C02F1/30C02F1/722C02F1/725C01P2004/38C01P2004/39C01P2004/24C02F2305/026C02F2305/10C02F2101/308B01J35/40
Inventor 胡钟霆金子彦赵峻赵佳吴骏丁寅邢文豪
Owner ZHEJIANG UNIV OF TECH
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